Characteristic of Duplex Stainless Steel?
Date:2024-04-18
Duplex stainless steel is a kind of steel with excellent corrosion resistance, high strength and easy manufacturing. Their physical properties are between austenitic stainless steel and ferritic stainless steel, but more similar to ferritic stainless steel and carbon steel. The resistance of duplex stainless steel to chloride pitting and crevices is related to the content of chromium, molybdenum, tungsten and nitrogen, and can be similar to 316 stainless steel or higher than that of seawater stainless steel such as 6%Mo austenitic stainless steel. The resistance of all duplex stainless steels to chloride stress corrosion fracture is obviously stronger than that of 300 series austenitic stainless steels
Characteristics of duplex stainless steel
01- High strength
The strength of duplex stainless steel is about twice that of conventional austenitic or ferritic stainless steel. This allows designers to reduce the wall thickness in some applications
02- Good toughness and ductility
Despite their high strength, duplex stainless steels exhibit good plasticity and toughness. The toughness and ductility of duplex stainless steel is significantly better than that of ferritic stainless steel and carbon steel, maintaining good toughness even at very low temperatures such as -40℃/F. But not as good as austenitic stainless steel.
03- Corrosion resistance
The corrosion resistance of stainless steel depends mainly on its chemical composition. In most applications, duplex stainless steels show high corrosion resistance due to their high chromium content, which is favorable in oxidizing acids, and sufficient molybdenum and nickel content to resist corrosion in medium reducing acid media.
